It will be Spencer's second of five mounts before he rides Brave Smashin The Everest and Waller describes the 37-year-old's availability as "absolute privilege".

Aonair broke her maiden first-up this preparation but found a Benchmark 74 Handicap (1300m) at Rosehill a tougher proposition.

She now takes on her own age and sex.

"She's a filly that probably wants a bit further than the 1400 but it's a good opportunity to get some black-type for her," Waller's racing manager Charlie Duckworth said.

Waller also has filly First In Hand chasing her first win in the Reginald Allen after she was scratched from Warwick Farm on Wednesday.

Faith In Hand was transferred from Henry Dwyer's Caulfield stable in March and opened her account with Waller with a third over 1000 metres at Flemington last month.

"It's a bit of a gamble stepping her up to 1400 but she's worked well through the week," Waller said.

Highly regarded mare Oklahoma Girl can state her case for a Melbourne campaign in The Star Mile alongside stablemates Jaminzah, Invincibella and Black On Gold.

"If we handle her right we can get her down to Melbourne for a race like the Matriarch," Waller said.

He also has dual Oaks winner Egg Tart making a belated bid for Group One glory this season as the favourite for the Toorak Handicap at Caulfield after she missed the Epsom Handicap with an eye problem.